Flash Flood in Grafton County, New Hampshire

Flash Flood July 1, 2017 · Grafton County, New Hampshire

$4.0M

Damage as recorded

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Thunderstorms produced 2 to 5 inches of rain in Orford washing out portions of Route 25A and numerous roads along the Connecticut River.

The wider storm

A very strong shortwave and associated cold front were approaching from the west on the morning of July 1st. Ahead of the front, a very warm and moist air mass was in place over New England with values of precipitable water around 2 inches. Strong directional and speed shear contributed to numerous super cells that produced damaging winds. In addition, very heavy rain associated with these cells produced extensive flash flooding to many area roads with damage totaling in the millions.

Began near Orford (43.8896, -72.1034).

Source: NOAA Storm Events Database, event 715626. Narratives are written by the National Weather Service forecast office that issued the report.

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